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Interactive
Other

Quick Math: Numbers Percentages

For Students 9th - 10th Standards
This QuickMath activity changes percentages to decimals or fraction and vice versa. It also calculates a certain percent of a number or vice versa.
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Unit Plan
CK-12 Foundation

Ck 12: Chemistry: Calculating Atomic Mass

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Covers definition of atomic mass and calculations of atomic mass.
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Interactive
Calculator Soup

Calculator Soup: Percentage Calculator

For Students 9th - 10th
Find a percentage or work out the percentage given numbers and percent values. Use percent formulas to figure out percentages and unknowns in equations. Add or subtract a percentage from a number or solve the equations.
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Activity
University of Cambridge

University of Cambridge: Nrich: Put Out the Flags

For Students 5th - 8th Standards
Sharpen your logic and percent skills while working on this challenge. A strategy for solving the problem and the solution are available from links on the left.
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Interactive
Calculator Soup

Calculator Soup: Tip Calculator

For Students 9th - 10th
Calculate a tip or gratuity and get the total amount to pay. Enter your meal or dinner cost along with the tip percentage. If you are splitting the cost at a restaurant among several people you can divide by the number of people to get...
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Unit Plan
Texas Education Agency

Texas Gateway: Ap Physics: 1.3 Accuracy, Precision, and Significant Figures

For Students 9th - 10th
By the end of this section, you will be able to do the following: Determine the appropriate number of significant figures in both addition and subtraction, as well as multiplication and division calculations and Calculate the percent...
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Interactive
Mangahigh

Mangahigh: Number: Find One Amount as a Percent of Another No Calculator

For Students 6th - 8th Standards
When given a word problem determine the fraction.
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Unit Plan
Khan Academy

Khan Academy: Discount, Tax, and Tip Word Problems

For Students 6th - 8th Standards
Practice solving word problems involving price discounts, taxes, and tip calculations. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Interactive
BBC

Bbc: Ks3 Maths: Percentages

For Students 9th - 10th
KS3 Math provides interactive activities on percentages, using pence and pounds. Use the factsheet for percentage information. You may use the worksheet for percentage practice and take the test provided to check your percentage skills....
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Activity
Texas Instruments

Texas Instruments: Math Today for Ti: Is Leisure Time Really Shrinking

For Teachers 9th - 10th
Students will to organize data from the USA TODAY Snapshot, "Is leisure time really shrinking?," into two scatter plots and determine the quadratic model for each scatter plot. Students will determine if these graphs intersect and learn...
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Interactive
Calculator Soup

Calculator Soup: Percent to Fraction Calculator

For Students 9th - 10th
This online calculator converts a percent to a fraction. If the percent value is greater than 100% it is converted into a mixed number fraction. Enter percents to convert them into fractions. The number you enter can also have decimal...
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Interactive
Calculator Soup

Calculator Soup: Decimal to Percent Calculator

For Students 9th - 10th
Convert decimals to percentages with this calculator. Input a decimal number to convert both the whole number and decimal part of the number to a percent value.
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Interactive
Calculator Soup

Calculator Soup: Fraction to Percent Calculator

For Students 9th - 10th
Convert a fraction to a percent. Convert proper and improper fractions to percentages. This calculator shows the steps and work to convert a fraction to a percentage number.
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Activity
National Council of Teachers of Mathematics

Nctm: Figure This: Majority Vote

For Students 3rd - 8th
Cast your vote for this math challenge that explores calculating percentages as it relates to voting. Discover how mastering this skill will be beneficial in real life situations. A one page activity from the NCTM Math Challenges for...
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Activity
University of Cambridge

University of Cambridge: Nrich: The Magic Number and the Hepta Tree

For Students 3rd - 8th Standards
Use your calculator to help you solve this challenge at this one page website. You can check your solution with only one click of the mouse.
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Activity
Hopelink

Hopelink: Teaching Percentages

For Teachers 9th - 10th
Students can brush up on percentage skills with this lesson and calculate percentages using the "Percent Tricks method." For students to successfully use this method, they must have the ability to multiply and divide whole numbers.
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Activity
National Council of Teachers of Mathematics

Ntcm: Math Challenge: Perplexing Percentages

For Students 3rd - 8th
Test your bargin shopping skills by figuring out which discount offers the greatest savings. A one page activity from the NCTM Math Challenges for Families series that focuses on understanding and calculating percentages. Connections...
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Activity
BBC

Bbc: Percentages

For Students 9th - 10th Standards
You can pick up some valuable percentage pointers on how to work with them. When you finish working your way through the pages, you can take an on-line "Test Bite" and check your understanding.
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Unit Plan
Math Is Fun

Math Is Fun: Compound Interest

For Students 9th - 10th Standards
Explains, with examples, what compound interest is and how to calculate it using a formula. Also shows how to work backwards to calculate the present value of an investment, how compound interest is calculated for different compounding...
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Unit Plan
Carnegie Mellon University

Chem Collective: Composition Determination of a Mixture

For Students 9th - 10th
In this activity, students calculate the percent composition of a mixture of two arsenic-containing minerals. Step-by-step support and feedback is provided for students who need additional help.
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Unknown Type
McGraw Hill

Glencoe: Self Check Quizzes 1 Geometry Area of Rectangles

For Students 9th - 10th
Use Glencoe's randomly generated self-checking quiz to test your knowledge of finding the area of rectangles. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the "Check...
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Interactive
Fun Brain

Funbrain: Penguin Waiter

For Students 5th - 8th
Calculate the correct tip to leave the waiter.
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Website
University of Nebraska

Carbon 14 Dating Calendar

For Students 9th - 10th
Provides a Carbon 14 Dating Calculator to compute the percent of Carbon 14 remaining after a given number of years. Also calculates how many years have elapsed from how much Carbon 14 remains.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Le Carbon 14 Dating, Variation 2

For Teachers 9th - 10th Standards
In this task on exponential decay, students calculate what the amount of Carbon 14 left in a preserved plant will be as time passes and when one microgram will be all that is left. Aligns with F-LE.A.1.c.